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You _______________conduct any chemistry experiments unless you are wearing safety glasses.

A. mustn’t

B. don’t have to

Pasteur devoted all his life _______ science.

A. for

B. in

C. on

D. to

Did Ann have dinner at six o’clock?

A. Yes, I did.

B. Yes, he did.

C. Yes, she did.

D. Yes, they did.

… any brothers or sisters?

A. Are you having

B. Are you have

C. Do you have